Five new species of the genus Stigmus Panzer (Hymenoptera, Crabronidae) from China, with a key to all Chinese species

Five new species of the genus Stigmus Panzer, 1804 are described and illustrated from Yunnan and Shaanxi provinces of China: S. carinannulatus Li & Ma, sp. nov., S. clypeglabratus Li & Ma, sp. nov., S. flagellipilaris Li & Ma, sp. nov., S. rugidensus Li & Ma, sp. nov., and S. sulciconspicus Li & Ma, sp. nov. In addition, S. solskyi Morawitz, 1864 is recorded in China for the first time. An illustrated key to known and new species of the genus Stigmus Panzer from China is provided.